Can you be more specific? When you say user, are you referring to staff members on a shop or customers (buyers)?
If you are referring to staff members and creating a private app on a Plus store, you can use the Plus-only User API.
If you are referring to customers, you can use our Customer API.
Further to ShopifyPlus...we need to get the details of staff account settings
I can see this available through the /user feature but only for ShopifyPlus accounts. Is there a reason why this is restricted, even just the Get, and are their plans/is it possible to extend this to non-plus store accounts?